Seiko Cal. 4581 - 663

Seiko 4581-663

The 4581-663 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4581 caliber with 33j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-baf8a48436cc]

Also known as: Bullhead

Specifications

Movement
Hand-Winding
Case Material
Stainless Steel
Case Width
40mm
Case Thickness
14.8mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
150m
Dial Color
Navy
Jewels
33j
Frequency
36,000 bph
Power Reserve
37 hours
Year
1973

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